A DR8 silicon photonic chip and an 800G DR8 optical engine

Abstract

The present invention relates to a DR8 silicon photonic chip, which integrates two input waveguides and eight output waveguides. The two input waveguides and the eight output waveguides are on the same side. The eight output waveguides are all tilted 8°. The two input waveguides are mirror-distributed in the horizontal direction in an eight-shaped pattern, and the beam ends face outward. An 800G DR8 optical engine, wherein two optical emitting ends are distributed in an eight-shaped pattern in the horizontal direction, and the light beams emitted by the two optical emitting ends have a crossover point. A polarization-independent optical isolator is arranged at the crossover point of the light beams emitted by the two optical emitting ends. The optical signals emitted by the two optical emitting ends are respectively coupled into the two input waveguides on the DR8 silicon photonic chip after passing through the same polarization-independent optical isolator. The beneficial effects are: a polarization-independent optical isolator can be saved, thereby effectively reducing costs, and the tilted distribution of the two input waveguides can further reduce light reflection and improve optical performance relative to the existing 0°.

Description

Technical Field

[0001] The present invention relates to the field of optical engine technology, and in particular to a DR8 silicon photonic chip and an 800G DR8 optical engine. Background Art

[0002] The existing 800G DR8 optical engine structure is as follows Figure 1 As shown, it includes: a DR8 silicon photonic chip, two light emitting ends, two polarization-independent optical isolators, two collimating lenses, two converging lenses and an eight-channel optical fiber array. The DR8 silicon photonic chip has two horizontally distributed input waveguides and eight output waveguides tilted at 8° on the same side. The output waveguide is tilted at 8° to reduce light reflection. The light beams emitted by the two light emitting ends are parallel to each other. The light emitting end includes: a ceramic heat sink and a laser chip fixed on the ceramic heat sink. The light beam emitted by one of the light emitting ends is coupled into one of the input waveguides after passing through a collimating lens, a polarization-independent optical isolator and a converging lens in sequence, and the light beam emitted by the other light emitting end is coupled into one of the input waveguides after passing through another collimating lens, another polarization-independent optical isolator and another The eight-channel fiber array is tilted 8° at its end face and coupled to the eight output waveguides of the DR8 silicon photonic chip. The input light of each input waveguide is evenly divided into four paths. The input light of one of the two input waveguides is divided into four paths and then coupled into four of the eight output waveguides, while the input light of the other input waveguide is divided into four paths and then coupled into the remaining four of the eight output waveguides. The output lights of the eight output waveguides are respectively coupled into the eight optical fibers in the eight-channel fiber array. In this scheme, there are two polarization-independent optical isolators. Since the polarization-independent optical isolator can prevent the reflected light from affecting the laser chip, it cannot be omitted, and thus the cost of this scheme is relatively high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a DR8 silicon photonic chip and an 800G DR8 optical engine to overcome the deficiencies in the above-mentioned prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a DR8 silicon photonic chip, which integrates two input waveguides and eight output waveguides. The two input waveguides and the eight output waveguides are on the same side, and the eight output waveguides are distributed at an angle of 8°. The two input waveguides are distributed in an eight-shaped mirror image in the horizontal direction, and the beam end faces outward.

[0005] The beneficial effect of the present invention is that the two input waveguides of the silicon photonic chip are distributed in an eight-shaped mirror image in the horizontal direction, and the beam ends face outward, that is, the two input waveguides are distributed obliquely, so that when the silicon photonic chip is applied to the 800G DR8 optical engine, the two light emitting ends can also be distributed in an eight-shaped shape in the horizontal direction, and the light beams emitted by the two light emitting ends will have an intersection point, and then the polarization-independent optical isolator is arranged at the intersection point of the light beams emitted by the two light emitting ends, so that the optical signals emitted by the two light emitting ends can be respectively coupled into the two input waveguides on the DR8 silicon photonic chip after passing through the same polarization-independent optical isolator. Since the two light emitting ends can share one polarization-independent optical isolator, compared with the prior art, one polarization-independent optical isolator can be saved, thereby effectively reducing costs. At the same time, the inclined distribution of the two input waveguides can further reduce light reflection compared to the existing 0°, thereby improving optical performance.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the tilt angle of the input waveguide in the horizontal direction is 6° to 13°.

[0008] The further beneficial effects of adopting the above method are: the larger the angle, the larger the size of the polarization-independent optical isolator and the higher the cost; the smaller the angle, the smaller the size of the polarization-independent optical isolator. However, in order to avoid interference between the two lenses, the total distance from the laser chip to the silicon photonic chip in the light emitting end will be longer. Therefore, this range of angles is selected based on the cost and the total space for packaging the optical engine.

[0009] Furthermore, the tilt angle of the input waveguide in the horizontal direction is 11°.

[0010] A further beneficial effect of the above method is that the size of the polarization-independent optical isolator at this angle only needs to be larger than 0.45 mm.

[0011] Based on the above technical solution, the present invention also provides an 800G DR8 optical engine, including: two optical emitting ends, a polarization-independent optical isolator and a DR8 silicon photonic chip, the two optical emitting ends are distributed in an eight-shaped pattern in the horizontal direction, the light beams emitted by the two optical emitting ends have a crossover point, the polarization-independent optical isolator is arranged at the crossover point of the light beams emitted by the two optical emitting ends, and the optical signals emitted by the two optical emitting ends are respectively coupled into two input waveguides on the DR8 silicon photonic chip after passing through the same polarization-independent optical isolator.

[0012] The further beneficial effect of adopting the above is: the two light emitting ends are also distributed in an eight-shaped shape in the horizontal direction, and the light beams emitted by the two light emitting ends will have an intersection point, and then the polarization-independent optical isolator is arranged at the intersection point of the light beams emitted by the two light emitting ends, so that the optical signals emitted by the two light emitting ends can be respectively coupled into the two input waveguides on the DR8 silicon photonic chip after passing through the same polarization-independent optical isolator. Since the two light emitting ends can share one polarization-independent optical isolator, compared with the prior art, one polarization-independent optical isolator can be saved, thereby effectively reducing the cost. At the same time, the tilted distribution of the two input waveguides can further reduce light reflection compared to the existing 0°, thereby improving the optical performance.

[0013] Furthermore, a collimating lens is coupled between each light emitting end and the polarization-independent optical isolator.

[0014] The further beneficial effect of adopting the above method is as follows: the collimating lens converges the emitted light from the light emitting end into parallel light. The spot diameter of the parallel light is generally around 0.3mm, so the size of the polarization-independent optical isolator should be greater than 0.3mm. If the light spot has an angle with the polarization-independent optical isolator, then the size of the polarization-independent optical isolator should be increased. For example, at 11°, the size of the polarization-independent optical isolator should be greater than 0.45mm, and at 13°, the size of the polarization-independent optical isolator should be greater than 0.5mm. Generally, the larger the size of the polarization-independent optical isolator, the more expensive it is. The minimum size of the polarization-independent optical isolator is generally 0.45mm. When it is less than 0.45mm, more cutting waste will occur.

[0015] Furthermore, the size of the polarization-independent optical isolator is at least larger than 0.45 mm.

[0016] Furthermore, a converging lens is coupled between the polarization-independent optical isolator and each input waveguide.

[0017] A further beneficial effect of the above method is that the converging lens is used to converge the light emitted from the polarization-independent optical isolator into the input waveguide.

[0018] Furthermore, it also includes: an eight-channel optical fiber array, the end face of the eight-channel optical fiber array is inclined at 8°, and the eight-channel optical fiber array is coupled to eight output waveguides of the DR8 silicon photonic chip.

[0019] Furthermore, the light emitting end includes: a ceramic heat sink and a laser chip fixed on the ceramic heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of an 800G DR8 optical engine in the prior art;

[0021] Figure 2 This is a structural diagram of the DR8 silicon photonic chip in the present invention;

[0022] Figure 3 This is a structural diagram of the 800G DR8 optical engine in the present invention;

[0023] Figure 4 This is the minimum size diagram of the polarization-independent optical isolator when the input light is tilted 11°;

[0024] Figure 5 This is the minimum size diagram of the polarization-independent optical isolator when the input light is tilted 13°.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. DR8 silicon photonic chip, 110, input waveguide, 120, output waveguide, 2. optical transmitter, 210, ceramic heat sink, 220, laser chip, 3. polarization-independent optical isolator, 4. eight-channel optical fiber array, 5. collimating lens, 6. converging lens. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] Example 1

[0029] like Figure 2 As shown, a DR8 silicon photonic chip integrates two input waveguides 110 and eight output waveguides 120, the two input waveguides 110 and the eight output waveguides 120 are on the same side, the eight output waveguides 120 are tilted 8°, the two input waveguides 110 are mirror-distributed in an eight-shaped shape in the horizontal direction, and the beam ends face outwards;

[0030] The two input waveguides 110 of the DR8 silicon photonic chip 1 are distributed in an eight-shaped mirror image in the horizontal direction, and the beam ends face outward, that is, the two input waveguides 110 are distributed tilted, so that when the DR8 silicon photonic chip 1 is used in an 800G DR8 optical engine, the two optical emitting ends 2 can also be distributed in an eight-shaped shape in the horizontal direction, and the light beams emitted by the two optical emitting ends 2 will have an intersection. Then, the polarization-independent optical isolator 3 is arranged at the intersection of the light beams emitted by the two optical emitting ends 2. In this way, the optical signals emitted by the two optical emitting ends 2 can be coupled into the two input waveguides 110 on the DR8 silicon photonic chip 1 respectively after passing through the same polarization-independent optical isolator 3. Since the two optical emitting ends 2 can share one polarization-independent optical isolator 3, compared with the prior art, one polarization-independent optical isolator 3 can be saved, thereby effectively reducing the cost. At the same time, the tilted distribution of the two input waveguides 110 can further reduce light reflection compared with the existing 0°, thereby improving the optical performance.

[0031] Example 2

[0032] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0033] The input waveguide 110 has an inclination angle of 6° to 13° in the horizontal direction, which can be understood as one of the two input waveguides 110 is inclined upward by 6° to 13° in the horizontal direction, and the other input waveguide 110 is inclined downward by 6° to 13° in the horizontal direction. The larger the angle, the larger the size of the polarization-independent optical isolator 3 and the higher the cost. The smaller the angle, the smaller the size of the polarization-independent optical isolator 3. However, in order to avoid interference between the two lenses, the total distance from the laser chip 220 in the optical emitting end 2 to the silicon photonic chip will be longer. Therefore, this range of angles is selected based on the cost and the total space for packaging the optical engine.

[0034] In the present invention, the inclination angle of the input waveguide 110 in the horizontal direction is preferably 11°, which can be understood as one of the two input waveguides 110 is inclined 11° in the positive direction in the horizontal direction, and the other input waveguide 110 is inclined 11° in the negative direction in the horizontal direction.

[0035] Example 3

[0036] like Figure 3 As shown, an 800G DR8 optical engine includes: two optical emitting ends 2, a polarization-independent optical isolator 3 and a DR8 silicon photonic chip 1 as in Example 1 or 2, the two optical emitting ends 2 are distributed in an eight-shaped pattern in the horizontal direction, the inclination angle of the two optical emitting ends 2 is the same as the inclination angle of the two input waveguides 110, the light beams emitted by the two optical emitting ends 2 have a crossover point, and the polarization-independent optical isolator 3 is arranged at the crossover point of the light beams emitted by the two optical emitting ends 2, and the optical signals emitted by the two optical emitting ends 2 are respectively coupled into the two input waveguides 110 on the DR8 silicon photonic chip 1 after passing through the same polarization-independent optical isolator 3. In the present invention, since the two optical emitting ends 2 can share one polarization-independent optical isolator 3, compared with the prior art, one polarization-independent optical isolator 3 can be saved, thereby effectively reducing the cost, and at the same time, the inclination distribution of the two input waveguides 110 can further reduce light reflection compared with the existing 0°, thereby improving the optical performance.

[0037] Example 4

[0038] like Figure 3 , Figure 4 , Figure 5 As shown, this embodiment is a further improvement on the basis of embodiment 3, and the details are as follows:

[0039] A collimating lens 5 is coupled between each light emitting end 2 and the polarization-independent optical isolator 3. The collimating lens 5 converges the emitted light of the light emitting end 2 into parallel light. The spot diameter of the parallel light is generally about 0.3 mm, so the size of the polarization-independent optical isolator 3 should be greater than 0.3 mm. If there is an angle between the light spot and the polarization-independent optical isolator 3 (the angle between the emitted light of the light emitting end 2 and the polarization-independent optical isolator 3), the size of the polarization-independent optical isolator 3 should be increased. For example, at 11°, the size of the polarization-independent optical isolator 3 should be greater than 0.45 mm, and at 13°, the size of the polarization-independent optical isolator 3 should be greater than 0.5 mm. Generally, the larger the size of the polarization-independent optical isolator 3, the more expensive it is. The minimum size of the polarization-independent optical isolator 3 is generally 0.45 mm. When it is less than 0.45 mm, more cutting waste will occur. Therefore, in the present invention, the size of the polarization-independent optical isolator 3 is at least greater than 0.45 mm.

[0040] Furthermore, a converging lens 6 is coupled between the polarization-independent optical isolator 3 and each input waveguide 110 , and the converging lens 6 is used to converge the light emitted from the polarization-independent optical isolator 3 into the input waveguide 110 .

[0041] Example 5

[0042] like Figure 3 As shown, this embodiment is a further improvement on the basis of Embodiment 3 or 4, and the details are as follows:

[0043] The 800G DR8 optical engine also includes: an eight-channel optical fiber array 4, the end face of the eight-channel optical fiber array 4 is tilted 8°, and the tilt of 8° can reduce light reflection. The eight-channel optical fiber array 4 is coupled with the eight output waveguides 120 of the DR8 silicon photonic chip. The input light of each input waveguide 110 is evenly divided into four paths. The input light of one of the two input waveguides 110 is divided into four paths and then coupled into four of the eight output waveguides 120, while the input light of the other input waveguide 110 is divided into four paths and then coupled into the remaining four output waveguides 120 of the eight output waveguides 120. The output lights of the eight output waveguides 120 are respectively coupled into the eight optical fibers in the eight-channel optical fiber array 4.

[0044] In addition, the light emitting end 2 includes a ceramic heat sink 210 and a laser chip 220 fixed on the ceramic heat sink 210 .

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An 800G DR8 optical engine, characterized in that: include: Two optical emitting ends (2), a polarization-independent optical isolator (3) and a DR8 silicon photonic chip (1), wherein the DR8 silicon photonic chip (1) internally integrates two input waveguides (110) and eight output waveguides (120), the two input waveguides (110) and the eight output waveguides (120) are located on the same side, the eight output waveguides (120) are all distributed with an inclination of 8 degrees, the two input waveguides (110) are distributed in an eight-shaped mirror image in the horizontal direction, and the beam end faces outward, and one of the two input waveguides (110) is inclined upward by 6 degrees to 13 degrees in the horizontal direction. °, and the other input waveguide (110) is tilted downward by 6° to 13° in the horizontal direction; the two light emitting ends (2) are distributed in an eight-shaped pattern in the horizontal direction, the light beams emitted by the two light emitting ends (2) have a cross point, the polarization-independent optical isolator (3) is arranged at the cross point of the light beams emitted by the two light emitting ends (2), and the optical signals emitted by the two light emitting ends (2) are respectively coupled into the two input waveguides (110) on the DR8 silicon photonic chip (1) after passing through the same polarization-independent optical isolator (3), and the size of the polarization-independent optical isolator (3) is at least greater than 0.45 mm.

2. The 800G DR8 optical engine according to claim 1, characterized in that: The input waveguide (110) has an inclination angle of 11° in the horizontal direction.

3. The 800G DR8 optical engine according to claim 1, characterized in that: A collimating lens (5) is coupled between each light emitting end (2) and the polarization-independent optical isolator (3).

4. The 800G DR8 optical engine according to claim 3, characterized in that: A converging lens (6) is coupled between the polarization-independent optical isolator (3) and each input waveguide (110).

5. The 800G DR8 optical engine according to claim 1, characterized in that: Also includes: An eight-channel optical fiber array (4), the end face of which is inclined at 8°, and the eight-channel optical fiber array (4) is coupled to eight output waveguides (120) of a DR8 silicon photonic chip.

6. The 800G DR8 optical engine according to claim 1, characterized in that: The light emitting end (2) comprises: a ceramic heat sink (210) and a laser chip (220) fixed on the ceramic heat sink (210).

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